We were more worried about noise, because the cards can get pretty loud in 3D mode.Īfterburner tool detected the fan seriously speeding up from time to time. Naturally, the HD 6990’s temperatures are higher than those on the HD 6970, but the thermals end up just fine. We did not forget the HD 6990 quad CrossFireX, we simply did not have two of them. The scores show that slotting the HD 6970 next to a HD 6990 may improve performance up to almost 50%. However, we used the bios switch on the HD 6990 and boosted its GPU to 880MHz, in order to make it identical to the one on HD 6970. Note that when using two different graphics cards in CrossFireX, the faster card will downclock to the level of the slower card.
The HD 6970’s GPU runs at 880MHz while the HD 6990’s GPUs run at 830MHz. So, our multi-GPU system is made of three Cayman GPUs. Nvidia 270.51_desktop_win7_winvista_64bit The following table is incomplete but gives a nice insight into CrossFireX’s capabilities.ĬPU: Core i7 965 XE (Intel EIST andVdropenabled)
CrossFireX allows for pairing a dual and single GPU cards and we pounced on the chance to use HD 6990 and HD 6970. Unlike Nvidia’s SLI, AMD’s CrossFireX allows for daisy chaining a wider variety of cards.
Review: HD 6990 and HD 6970 happily running side by side
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